Way to update specific values in Bootstrap cards

I apologize for the amateur question here, however, I am experiencing some issues with a quick demo website I am creating for a friend.

The purpose of the site is to take the total of all “credit card values”, and then divide it by the total amount of “points” there are to arrive at the “points per dollar”

Once that is done, I’d like to multiply the “points per dollar” by the total amount of “points” that are specified in the dropdown menu by the user, and then update all of the cards that have something selected to be the proper math with their point values.

I’ve successfully done all the math and created functions, but I am unsure how to actually apply it to the specific cards that need it.

I’ve created functions to do the math, and update the header numbers, just not apply it to the respective cards.

My code can be found here

My website is running on an express.js server with e.js as the templating engine, with bootstrap and jquery.

Any suggestions/help would be very much appreciated.